What is the radical of this kanji?

She remembered her past resentments while singing a song of resentment.

In this town, the clearing out of mud from a ditch is carried out every spring.

He does the job of clearing out mud from a ditch every week.

Advent is the season to celebrate the period before Christmas.

Qingming Festival is a day to clean the ancestors' graves and show respect.

This text is organized using section signs.

He is good at finding stick insects.

I feel that my lymph nodes are swollen.

Meiji Festival is an important day in Japanese history.